Uploads file to a directory on the server.

fileUpload(destination [, fileField] [, mimeType] [, onConflict] [, strict]) → returns struct

Argument Reference

destination string

Path of directory in which to upload the file. If not an absolute path (starting with a drive letter and a colon, or a forward or backward slash), it is relative to the ColdFusion temporary directory returned by the function getTempDirectory. If the destination you specify does not exist, ColdFusion creates a file with the specified destination name.

fileField string

Name of form field used to select the file. Do not use number signs (#) to specify the field name.

mimeType string

Specify a comma-delimited list of MIME types and/or file extensions to test the uploaded file against. If the file is not of any of the types in this list, an error of type$InvalidUploadTypeExceptionis thrown.
If you specify file extensions, use this format: .txt,.jpg, not txt, *.txt, or *.*. You can use * as a wildcard to accept all files.

onConflict string
Default: error

Action to take if file has the same name of a file in the directory.
  • error
  • skip
  • overwrite
  • makeunique

strict boolean
Default: true

CF 10+ Defines which method is used to determine the file type to check against the value of the mimeType parameter.
true: The first few bytes of the uploaded file are used to determine the MIME type.
false: The MIME type provided by the browser in the request payload is used.

Sample code invoking the fileUpload function

<form method="post" enctype="multipart/form-data">
  <input type="file" name="fileInput">
  <button type="submit">Upload</button>

  if( structKeyExists( form, "fileInput" )) {
    try {
      uploadedFile = fileUpload( getTempDirectory(), "fileInput", "image/jpeg,image/pjpeg", "MakeUnique" );
      // check the file extension of the uploaded file; mime types can be spoofed
      if (not listFindNoCase("jpg,jpeg", uploadedFile.serverFileExt)) {
      throw("The uploaded file is not of type JPG.");
      // do stuff with uploadedFile...
    } catch ($InvalidUploadTypeException e ) {
      writeOutput( "This upload form only accepts JPEG files." );
    catch (any e) {
    writeOutput( "An error occurred while uploading your file: #e.message#" );

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